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September 10th, 2009, 11:34 AM  #1 
Member Joined: Feb 2008 Posts: 30 Thanks: 0  Completing the square
How do you do it when there is multiple variables. Ie. 1) 3x2+3x+2y=0 or 2) 9y26y9x=0 Thanks :S 
September 10th, 2009, 03:27 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 17,221 Thanks: 1294 
Treat the variable that isn't squared as though it's a constant.

September 10th, 2009, 03:33 PM  #3 
Member Joined: Feb 2008 Posts: 30 Thanks: 0  Re: Completing the square
Ok but in the second on there's four different terms.. :S

September 10th, 2009, 05:51 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 17,221 Thanks: 1294 
9y²  6y  9  x = 0 ? (3y  1)² = 10 + x.


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